2. 职称英语
  3. Bats emit sounds and generally use the echoes of these sounds highly efficiently

Bats emit sounds and generally use the echoes of these sounds highly efficiently

游客2024-01-13  37
问题 Bats emit sounds and generally use the echoes of these sounds highly efficiently to detect, locate, and catch their prey. However, it is claimed that the characteristic efficiency of this process is reduced by moths able to hear the sounds emitted by insect-eating bats. Which of the following statements, if true, best supports the claim above?
选项 A、Those moths that cannot hear the sounds emitted by insect-eating bats live longer on the average than those that can hear such sounds when both kinds of moth are in an environment continuously free of such bats.
B、Those moth species that cannot hear the sounds emitted by insect-eating bats are among the species of insects that are most likely to be caught by such bats.
C、When a moth changes its speed or direction of flight, there is a change in the sound pattern generated by the moth’s wing movements.
D、Moth species that can hear the sounds emitted by insect-eating bats are less likely to be caught by such bats than are moth species that cannot hear these sounds.
E、Moths that are capable of hearing the sounds emitted by insect-eating bats differ in their abilities to use evasive action to escape capture by such bats.
答案 D
解析 本题读题重点在“However”之后的部分，“…by moths able to hear the sounds emitted by insect—eating bats”表示原因，段落推理关系为：因为蛾子能听见蝙蝠发出的声音，所以蝙蝠抓昆虫的效率降低。若听得见蝙蝠发出声音的蛾子更不大可能被蝙蝠抓住，如(D)所说，那么就把原因A中的关键词“听得见声音的蛾子”与B中的“蝙蝠抓昆虫的效率降低”连了起来，所以(D)为正确答案；(B)易误选，但(B)只说明听不见蝙蝠发出声音的蛾子是最容易被抓住的“insect”，而不是“moth”，另外(B)也并未表明听得见蝙蝠发出声音的蛾子是否容易被抓住，所以(B)说明不了任何问题；(A)中的“live”与段落推理无关；(C)中的“the sound pattern generated by the moth’s wing movements”明显属于“偷换概念”；(E)中的“differ”只表明不同，但究竟谁不容易被抓住我们并不知道，所以(E)为无关选项。
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